Mil surp brass question

Folks, I have recently been delving into reloading GP11 brass, with Berdan large primers, and have recently purchased a small amount from an individual. They were kind enough to send me quite a few Berdan primed 7.62X54 and 303 British brass, both which I can use.
My question is this: The 303 British is some of that 1943 cordite loaded brass. Is this brass safe to use today, given if I am successful in depriming and repriming it?
Also, the 7.52X54 brass looks nice, is Berdan- primed, and has a head stamp of 87 on the top, and a character that looks kind of like an S on the bottom. Does anyone know anything about that brass, and again, if I am successful in depriming it, is it safe to reload? I will be washing them out in soap and water, prior to tumbling them, but wanted to get your opinions before I went to a lot of work for nothing.